2016 Lexus GS350 brake sensor

GS350_200t_GS F_OM_OM30E86U_(U)
2774-5. Using the driving support systems
4
Driving
■Conditions under which the vehicle-to-vehicle distance control mode may not function
correctly
In the case of the following conditions, op erate the brake pedal (or accelerator pedal,
depending on the situ ation) as necessary.
As the sensor may not be able to correctly detect vehicles ahead, the system may not
operate properly.
●When the vehicle ahead of you decelerates suddenly
●When the road curves or when the lanes are
narrow
●When steering wheel operation or your posi-
tion in the lane is unstable

GS350_200t_GS F_OM_OM30E86U_(U)
2814-5. Using the driving support systems
4
Driving
This mode employs a radar sensor to detect the presence of vehicles up to
approximately 400 ft. (120 m) ahead, determines the current vehicle-to-vehicle
following distance, and operates to maintain a suitable following distance from
the vehicle ahead.
Note that vehicle-to-vehicle distance will close in when traveling on long downhill
slopes.
Example of constant speed cruising
When there are no vehicles ahead
The vehicle travels at the speed set by the driver. The desired vehicle-to-vehicle dis-
tance can also be set by operating th e vehicle-to-vehicle distance button.
Example of deceleration cruising and follow-up cruising
When a preceding vehicle driving slower than the set speed appears
When a vehicle is detected running ahead of you, the system automatically deceler-
ates your vehicle. When a greater reduction in vehicle speed is necessary, the system
applies the brakes (the stop lights will come on at this time). The system will respond to
changes in the speed of the vehicle ahead in order to maintain the vehicle-to-vehicle
distance set by the driver. Approach wa rning warns you when the system cannot
decelerate sufficiently to prevent your ve hicle from closing in on the vehicle ahead.
Example of acceleration
When there are no longer any preceding vehicles driving slower than the set
speed
The system accelerates until the set speed is reached. The system then returns to con-
stant speed cruising.
Driving in vehicle-to-vehicle distance control mode
1
2
3

288
GS350_200t_GS F_OM_OM30E86U_(U)4-5. Using the driving support systems
■When the sensor may not be correctly detecting the vehicle ahead
In the case of the following and depending on the conditions, operate the brake pedal
when deceleration of the system is insuff
icient or operate the accelerator pedal when
acceleration is required.
As the sensor may not be able to correctly detect these types of vehicles, the approach
warning ( P. 285) may not be activated.
●Vehicles that cut in suddenly
●Vehicles traveling at low speeds
●Vehicles that are not moving in the same lane
●Vehicles with small rear ends (traile rs with no load on board, etc.)
●Motorcycles traveling in the same lane
●When water or snow thrown up by the surrounding vehicles hinders the detecting of
the sensor
●When your vehicle is pointing upwards
(caused by a heavy load in the luggage com-
partment, etc.)
●Preceding vehicle has an extremely high
ground clearance

GS350_200t_GS F_OM_OM30E86U_(U)
2894-5. Using the driving support systems
4
Driving
■Conditions under which the vehicle-to-vehicle distance control mode may not function
correctly
In the case of the following conditions, op erate the brake pedal (or accelerator pedal,
depending on the situ ation) as necessary.
As the sensor may not be able to correctly detect vehicles ahead, the system may not
operate properly.
●When the vehicle ahead of you decelerates suddenly
●When the road curves or when the lanes are
narrow
●When steering wheel operation or your posi-
tion in the lane is unstable

4537-2. Steps to take in an emergency
GS350_200t_GS F_OM_OM30E86U_(U)
7
When trouble arises
Electric power steering system warning light (warning buzzer) Indicates a malfunction in the EP S (Electric Power Steering) sys-
tem
 Have the vehicle inspected by your Lexus dealer immediately.
(Flashes)
(If equipped)
PCS (Pre-Collision System) warning light
●When the warning light flashes (and a buzzer sounds):
Indicates a malfunction in the PCS (Pre-Collision System)
 Have the vehicle inspected by your Lexus dealer immediately.
●When the warning light flashes (and a buzzer does not sound):
Indicates that the PCS (Pre-Collision System) is temporarily
unavailable, possibly due to either of the following:
• An area around the radar sensor or camera sensor being dirty
or covered with condensation, ice, stickers, etc.
 Clear the dirt, condensation, ice, stickers, etc.
( P. 233, 252, 260)
• Radar sensor or camera sensor being outside of its operational
condition range. (temperature etc.)
 If operational condition (temperature etc.) is satisfied, PCS
(Pre-Collision System) becomes to be available.
●When the warning li ght is illuminated:
Either the VSC (Vehicle Stability Control) system or PCS (Pre-
Collision System) is disabled or both are disabled.
 To enable the PCS (Pre-Collisio n System), enable both the
VSC system and PCS (Pre-Collision System).
(  P. 248, 311)
Slip indicator
Indicates a malfunction in:
• The VSC system;
•The TRAC system; or
• The hill-start assist control system
 Have the vehicle inspected by your Lexus dealer immediately.
The light will flash when the VSC or TRAC system is operating.
(Flashes)
(If equipped)
“A F S O F F ” i n d i c a t o r
Indicates a malfunction in the adaptive front-lighting system
 Have the vehicle inspected by your Lexus dealer immediately.
(Flashes)
(GS350/GS200t only)
Brake hold operated indicator
Indicates a malfunction in the brake hold system
 Have the vehicle inspected by your Lexus dealer.
Warning lightWarning light/Details/Actions

4687-2. Steps to take in an emergency
GS350_200t_GS F_OM_OM30E86U_(U)
(If equipped)
Indicates that the dynamic radar cruise control system
cannot be used temporarily due to bad weatherA buzzer also sounds.
 Use the radar cruise control system when it
becomes available again.
(If equipped)
Indicates that the radar crui se control system brake con-
trol function is temporarily unavailable
 Depress the brake.
Indicates a malfunction in the smart access system with
push-button start
A buzzer also sounds.
 Have the vehicle inspected by your Lexus dealer.
(If equipped)
Indicates that a Blind Spot Monitor sensor or the sur-
rounding area on the bumper is dirty or covered with ice
A buzzer also sounds.
 Clean the sensor and its surrounding area on the
bumper.
Wa r n i n g m e s s a g eDetails/Actions
(Flashes)

602What to do if... (Troubleshooting)
GS350_200t_GS F_OM_OM30E86U_(U)
●The seat belt reminder light is flashing
Are the driver and the front passenger wearing the seat belts? ( P. 4 5 4 )
●The parking brake indicator is on
Is the parking brake released? ( P. 2 1 0 )
Depending on the situation, other type s of warning buzzer may also sound.
( P. 4 5 2 , 4 5 9 )
●Did anyone inside the vehicle open a door during setting the alarm?
The sensor detects it and the alarm sounds. ( P. 74 )
To stop the alarm, turn the engine switch to IGNITION ON mode or start the
engine.
●Is the electronic key left inside the vehicle or the moon roof opened?
Check the message on the multi-information display. ( P. 4 5 9 )
●When a warning light turns on or a warning message is displayed, refer to
P. 452, 459. A warning buzzer sounds during driving
An alarm is activated and the horn sounds
A warning buzzer sounds when leaving the vehicle
A warning light turns on or a warning message is displayed

614Alphabetical index
GS350_200t_GS F_OM_OM30E86U_(U)
Outer foot lightsOuter foot lights ................................. 347
Replacing light bulbs ........................439
Wattage ................................................. 554
Outside rear view mirrors ................... 171 Adjusting and folding.......................... 171
Blind Spot Monitor........................... 298
Linked mirror function when reversing ..................................173
Mirror position memory .................. 160
Outside rear view mirror defoggers ............................334
Outside temperature display ..... 87, 94
Overheating, Engine .......................... 528
Paddle shift switches ........................... 204
Parking assist sensors (intuitive parking assist)
*
Parking brake.......................................... 210 If the parking brake cannot be released......................... 518
Operation ............................................... 210
Parking brake engaged warning buzzer .............................. 459
Parking brake engaged warning message .......................... 459
Parking lights ............................................215 Light switch ............................................ 215
Replacing light bulbs ........................439
Welcome light illumination control ......................... 138 PCS (Pre-Collision System)............. 237
Function ...................................................237
Warning light ....................................... 453
Warning message............................. 459
Personal lights ....................................... 348
Power easy access system .................160
Pop-up display ............................... 105, 117
Power outlets ......................................... 360
Power steering (Electric Power Steering system)................................ 309Warning light ....................................... 453
Warning message............................. 459
Power trunk opener and closer ....... 143
Power windows....................................... 175 Door lock linked window operation ........................... 176
Jam protection function.................... 175
Operation................................................ 175
Window lock switch .......................... 175
Pre-Collision System (PCS)............. 237 Function ...................................................237
Warning light ....................................... 453
Warning message............................. 459
P